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牛頓定律,又云牛頓運動定律,經典物理學之定律也。
定律有三:
其一曰:靜者不自動,動者不自止;動路必直,速率必均。[1]是謂慣性定律。
其二曰:動量之易正比於衝量。動量者,質量與速度之積也;衝量者,力與時之積也。()
後人釋曰:物所受之力等於質量與加速度之積也。()
其三曰:凡力皆有反力,等力反向也。
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